Huawei BTS3900C Installation Manual page 37

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Appendix
Pin assignment for the wires of the 120-ohm E1 surge protection transfer cable
Pin on the DB26
Connector
X.1
X.2
X.3
X.4
X.5
X.6
X.7
X.8
X.19
X.20
X.21
X.22
X.23
X.24
X.25
X.26
Wire Color
Wire Type
Blue
Twisted pair
White
Orange
Twisted pair
White
Green
Twisted pair
White
Brown
Twisted pair
White
Green
Twisted pair
White
Blue
Twisted pair
Red
Orange
Twisted pair
Red
Green
Twisted pair
Red
36
Label
R1
R2
R3
R4
T1
T2
T3
T4

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